Is there a way to get all shortcuts of 2.79 back?
While I made the same switch as you and felt like I had to relearn blender, I am now very comfortable with the new controls, and they are much more intuitive. However, if you do want to stay with they 2.79 controls, here’s how you do it:

Go to preferences>keymap. Next in the drop-down bar at the top that currently says blender, click on that and change the selection to “Blender 27X”. This should give you all the shortcuts from 2.79. Hope this helps!